Definition of disease occurrence
This protocol is extracted from research article:
Poultry disease occurrences and their impacts in Ethiopia
Trop Anim Health Prod, Jan 3, 2021; DOI: 10.1007/s11250-020-02465-6

Household survey participants were asked whether their chicken had been sick in the last 12 months prior to the interview and to describe the main disease symptoms they observed on the sick chickens. The respondents were also asked to rank the disease symptoms they observed into five-point Likert scale (very important, important, so-so, less important, or not important). Then, the disease occurrence was defined as “yes” responses when respondents answered “yes” and were able to mention and rank the following disease symptoms. The pre-defined disease symptoms were sudden death, general weakness (lethargy) expressed by not eating and moving, dull and/or closed eyes, abnormal discharges (nasal, ocular), abnormal droppings/diarrhea, ruffled/loss of feathers, skin lesions, paralysis (neck twisting, leg, wing paralyzes), abnormal sitting (sitting on haunches or lying down), wing droppings, discolorations (head, wattle, comb) and/or staining (vent), weight loss, sudden production lose/egg laying, abnormal gait/lameness, and/or any local swelling and related symptoms. Then, the described disease symptoms were grouped into disease problem categories, which were gastrointestinal, eye-facial-head, respiratory, reproductive, neurological, musculoskeletal problems, and general illness as well as sudden deaths and parasite infestation. Eye-facial-head problems are defined as any disease manifestations as reported by the respondents and which locally affect either eye, face, or head parts of the chickens.

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